/Engine/Source/Runtime/AIModule/Classes/Navigation/PathFollowingComponent.h
Based on Path's properties, original move goal location and requested AcceptanceRadius this function calculates actual acceptance radius to apply when testing if the agent has successfully reached requested goal's vicinity
float GetFinalAcceptanceRadius ( const [FNavigationPath](API\Runtime\NavigationSystem\FNavigationPath) & PathInstance, const FVector OriginalGoalLocation, const FVector * PathEndOverride ) const